Implement a switch for switching between light and dark mode

blog/templates/macros.html

@@ -54,6 +54,17 @@
     </script>
 {% endmacro utterances %}
 
+{% macro utterances_edition_3() %}
+    <script src="https://utteranc.es/client.js"
+        data-repo="phil-opp/blog_os"
+        data-issue-term="url"
+        data-label="comments"
+        crossorigin="anonymous"
+        theme="preferred-color-scheme"
+        async>
+    </script>
+{% endmacro utterances_edition_3 %}
+
 {% macro toc(toc) %}
     <details id = "toc-inline">
         <summary><b>Table of Contents</b></summary>